Hot-air stove.



Patented Nov. 4, I902. D. LAMOND.

HOT AIR STOVE.

(Application filed Dec. 80, 1901.)

2 Sheets-Sheet I.

(No Model.)

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'No, 7|2, e9o. Pmmd Nbv. 4, [902. u. LAMOND.

HOT AIR STOVE.

(Application filed. Dec. 30, 1901.) (No Model.) 2 Sheets-Sheet 2.

in: NORRIS PETERS co, PuoYoun-(Q, WASHINGTON, u. cv

UNITED STATES PATENT OFFICE.

DAVID LAMOND, OE PITTSBURG, PENNSYLVANIA.

HOT-Al R STOVE.

SPECIFICATION formingpart of Letters Eatent No. 712,690, dated November4, 1902.

Application filed December 30, 1901- Serial No. 87,735. (No model.)

To all whmn it may concern:

Be it known that I, DAVID LAMOND, a citizen of the United States,residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Hot-AirStoves, of which improvement the following is a specification.

My invention relates particularly to the construction of thepartition-walls which divide the lattice brickwork and combustion-fluein hot-air stoves. I

The object of my invention is to provide a structure that will remainintact, or, in other words, preserve its form for an indefinite periodregardless of the expansion and contrac-, tion occasioned therein byvariations of term perature. With this object in View I have in theaccompanying drawings illustrated a stove embodying my improvements,where- 111 Figure 1 is a longitudinal sectional view of a stove of theabove-described character,sh0wing my improvements. Fig. 2 is an enlargedsectional view of the same, more fully disclosing said structure.

Referring to said views for adescription in detail, the numeral 1designates the outer cylindrical wall of said stove, and 2 thecombustion-flue thereof. In this case the combustion-flue 2 presents,sectionally, a convexed appearance, one side thereof being formed by awall A, composed of a series of built-up layers of bricks 3, arrangedradially from B to O, the opposite wall D being composed of built-uplayers of bricks 4, radially arrranged in reverse direction. The saidwall D is reinforced at its rear by a structural wall E, extending fromF to G, presenting a practically straight surface excepting for theoffsets 5 and 6, formed therein. Diametrically across the stove and atright angles from the said wall E and engaging into a radial wall D atthe opposite side of the stove from H to I is formed a divisional-wallstructure J. From the ends of said wall E at F and G are formed thestructural walls K and L, which walls have formed thereon the ofisets 7and 8 as they recede toward said wall D.

Grooves are formed within all surface-walls except those of thecombustion-fine for the reception of. the lattice-brickwork 9, whichlattice -work forms the main vertical passages 10.

The vertical passages extending from H to I, wherein the shortlattice-brick are em- .it is impossible for said wall D to collapse, as

said wall may be said from its structure to possess all the qualities ofa keystone, resisting Whatever strain may be placed thereupon byexpansion in the lattice-work.

I am aware that others have employed lattics-work in furnace structurewith grooves in the walls to receive the lattice-brick connectin gtherewith and division-walls therein; but they differ in structure fromthat herein illustrated and claimed.

What I claim as new, and desire to secure by Letters Patent, is-

1. In ahot-air stove, alattice-work, a covering for the rearlattice-work flues and a combustion-flue having sectionally a convexedform, one side of which forms, a divisional wall between the flue andthe lattice-work.

2. In a hot-air stove, a lattice-work, a flue having a wall concaved onthe flue side and straight on the lattice-work side and a covering 11,over the rear lattice-work fines.

3. In a hot-air stove, a lattice-work, a combustion-fiue havingsectionally a convexed form, one side of which forms a divisional wallbetween the flue and the lattice-work, a covering for the rearlattice-work lines and a wall J dividing the lattice-work.

In testimony whereof I have hereunto signed my name in the presence oftwo subscribing witnesses.

DAVID LAMOND. In presence of- D.'D. LAMOND, FRED. O. HENZI.

